Vertical drilling from the top of the Silkyara tunnel, where 41 workers have been trapped for the last 15 days, progressed to 31 metres on Monday as a team of rat-hole miners arrived at the site to start manual drilling horizontally through the rubble. Vertical and manual horizontal drilling are the two methods on which rescue efforts are being focused at the moment. Work on the other options, such as horizontal drilling from the Barkot end of the tunnel is also underway.

A total of 86 metres have to be drilled vertically to prepare an escape passage. Pipes of 1.2 metres in diameter have to be laid vertically through the top of the tunnel on which work began on Sunday as a second option to reach the labourers. Lt Gen Harpal Singh (retd), former engineer-in-chief of the Army said that vertical drilling has been done up to 31 metres. Singh, who has also headed the Border Roads Organisation, is involved in the rescue operation.